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How could a hot shoe adapter with a single contact possibly work?

Although you can't tell from the image, I suspect that there is a springy bit of metal that supplies the ground, between the flange and the knurled knob. If you have a voltmeter, set it to ohms or ...
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How could a hot shoe adapter with a single contact possibly work?

Jan Steinman was right. His answer encouraged me to get the product and there was indeed a contact to the camera ground hidden under the flange. Here is a picture of it:
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